qspec.models.fwhm_voigt_d  (  gamma ,  gamma_d ,  sigma ,  sigma_d  )[source]

The uncertainty of the full width at half maximum (FWHM) of a Voigt profile $$ \Delta\delta\nu = \sqrt{\left(\frac{8\log(2)\sigma\Delta\sigma}{\sqrt{0.2166\Gamma^2 + 8\log(2)\sigma^2}}\right)^2 + \left(\left(0.5346 + \frac{0.2166\Gamma}{\sqrt{0.2166\Gamma^2 + 8\log(2)\sigma^2}}\right)\Gamma_d\right)^2} $$

Parameters:

gammaarray_like

The FWHM of the Lorentzian $\Gamma$ (arb. unit).

gamma_darray_like

The uncertainty of gamma $\Delta\Gamma$.

sigmaarray_like

The standard deviation of the Gaussian $\sigma$ ([gamma]).

sigma_darray_like

The uncertainty of sigma $\Delta\sigma$.

Returns:

outndarray

The uncertainty of the FWHM of a Voigt profile $\Delta\delta\nu$.